Manning climate

Manning Frost Dates and Growing Season

NOAA 1991-2020 normals for Denison, 26 km from Manning, elevation 1401 ft

Frost and the growing season

NOAA's 1991-2020 freeze probabilities for Denison. A median date has an even chance of a later freeze in spring, or an earlier one in fall.

The last spring freeze typically comes around April 27 and the first fall freeze around October 11, a growing season of about 166 days.

Median at 36°F
last May 5, first October 1
Median at 32°F
last April 27, first October 11
Median at 28°F
last April 17, first October 22

Last freeze in spring

The chance of a later freeze than the date shown. At 10 percent, one spring in ten still freezes after the date; planting after the 10 percent date for 32°F is the cautious choice.

Threshold10%20%30%40%50%60%70%80%90%
36°FMay 16May 12May 10May 7May 5May 3May 1Apr 29Apr 24
32°FMay 9May 4May 2Apr 30Apr 27Apr 24Apr 21Apr 18Apr 13
28°FApr 30Apr 27Apr 24Apr 21Apr 17Apr 15Apr 12Apr 7Apr 3
24°FApr 23Apr 18Apr 14Apr 11Apr 8Apr 5Apr 3Mar 31Mar 23
20°FApr 16Apr 10Apr 6Apr 3Mar 31Mar 29Mar 24Mar 19Mar 13
16°FApr 7Apr 2Mar 31Mar 26Mar 22Mar 18Mar 15Mar 10Mar 5

First freeze in fall

The chance of an earlier freeze than the date shown. At 10 percent, one fall in ten freezes before the date.

Threshold10%20%30%40%50%60%70%80%90%
36°FSep 18Sep 22Sep 26Sep 28Oct 1Oct 3Oct 5Oct 9Oct 14
32°FSep 27Oct 1Oct 4Oct 7Oct 11Oct 14Oct 17Oct 20Oct 25
28°FOct 5Oct 13Oct 16Oct 19Oct 22Oct 24Oct 27Oct 30Nov 4
24°FOct 17Oct 22Oct 25Oct 28Oct 31Nov 2Nov 5Nov 8Nov 14
20°FOct 26Oct 31Nov 3Nov 6Nov 8Nov 11Nov 14Nov 19Nov 25
16°FNov 2Nov 7Nov 10Nov 13Nov 17Nov 20Nov 23Nov 28Dec 2

Growing season length

Days between the last spring and first fall freeze at each threshold, with the chance of a season at least that long.

Threshold10%20%30%40%50%60%70%80%90%
36°F166160155151148145140137129
32°F186179175170166162158154147
28°F205199194190186182178173165
24°F227219212208204201196192185
20°F242236231227222217212207199
16°F262253248244239234229223217

How often it gets that cold

The share of years with at least one night at or below each temperature.

36°F or colder
100% of years
32°F or colder
100% of years
28°F or colder
100% of years
24°F or colder
100% of years
20°F or colder
100% of years
16°F or colder
100% of years

Degree days

A degree day is one degree of the daily mean temperature beyond a base, for one day. Heating degree days count cold (the fuel a house burns), cooling degree days heat, growing degree days the warmth a crop needs; each crop has its own base.

Heating degree days, base 65°F
7,112
Cooling degree days, base 65°F
755
Growing degree days, base 40°F
4,946
Growing degree days, base 45°F
3,870
Growing degree days, base 50°F
2,908
Growing degree days, base 55°F
2,064
Growing degree days, base 60°F
1,344

Growing degree days by month, base 50°F

Heating and cooling by month

MonthHeating DDCooling DDGrowing DD 50
January1,43800
February1,17901
March929020
April544484
May23044303
June33166584
July6256715
August16196645
September13279405
October46311136
November876016
December1,26601

What this means

NOAA computes these from the daily lows at the station over 1991-2020, fitting the dates of each year's last and first freeze to a distribution, so a date can be stated at any level of risk. 36°F is a frost risk for tender plants on a clear, calm night, since the ground cools below the air above it; 32°F is a freeze; 28°F is a hard freeze that kills most annuals.

The station is 26 km from Manning. Low ground, valleys and open fields freeze earlier and later than a town center or a hillside.

More

Sources

NOAA NCEI U.S. Climate Normals, 1991-2020, annual and seasonal normals for station USC00132171 (Denison). Public domain.